Growth rates of alb-agouti transgenic mice and wild-type littermate controls. Body weights of alb-agouti 86 (A) and alb-agouti 83 (B) mice were recorded once every four weeks from 4–36 weeks of age and compared to littermate control mice. Shown are the means ± one standard error of the mean (for many of the means, the standard errors are too small to see the error bars). Sample sizes range from 6–22 for each mean. The weights of transgenic and control mice did not differ significantly (p > 0.05) at any time.